Malicious PDF — malware analysis report

Static analysis result for SHA-256 c75f275bf0b28595…

MALICIOUS

PDF

75.6 KB Created: 2021-03-25 01:46:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 51d936327fe5f91307e9c87cb5c58345 SHA-1: 9d345e7c6ec3cf3a4002c5430fb675c16fbd4e3a SHA-256: c75f275bf0b285951210092902900e4c4a2883e676077ee8a02504207786a6c4
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://dugedepap.ru/wix?keyword=bike+race+apk+mod+all+bikes+unlocked PDF link annotation
    • https://cdn.sqhk.co/gufemazibafi/iie6hay/podarujuxubeguv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376404/normal_601000f9b3670.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366947/normal_60253276b55b2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489045/normal_6015bf5b11389.pdfIn PDF document text
    • https://cdn.sqhk.co/sirepajaku/9gehf2T/nuxokibapi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401692/normal_60142984c0d01.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425504/normal_6015d6c86cec9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492915/normal_601b386abd5b5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490720/normal_5fe0d90d6abb5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419452/normal_602defea650da.pdfIn PDF document text
    • http://webmastervlad.ru/alan_walker_todo_cai_cano_de_mp3_da6aqa.pdfIn PDF document text
    • http://zathkatow.xyz/89374019177c4l7z.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450439/normal_60047efea8f02.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://0df6220b-9630-4647-aab6-0d9db69b9d59.filesusr.com/ugd/8b97dd_ff336ea45f7e44ca873f40ca43d56a08.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bulikowexunepov/what_shows_are_only_on_us_netflix.pdfIn PDF document text
    • https://s3.amazonaws.com/bidivo/instep_bike_trailer_instruction_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/sisaxu/pemowawiz.pdfIn PDF document text
    • https://43cb2d18-1589-43a7-b1c5-fe1278e1c76d.filesusr.com/ugd/370b54_bc22cea89c8344cd8c7e8104de67dab9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lowuwofuxali/genero_literario_definicion.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Related samples 4

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA91 5472 bytes
SHA-256: 67285041457f74269f99c72c4d31c7835c66307178cf1f38b0827628fca25819
font_01_sfnt_off0000fd11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD11 10756 bytes
SHA-256: e2e5d444f54da3e19c0638e3aa9f29d500f7607abc45f27b3d7a0ab960830017

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